Sewing machine



H. W. KRA'GZ SEWING MACHINE Filed July 5. 1922 Patented Jan. 13, 1925.

HARRY W. KRAG, OF ST. LOUIS, MISSOURI, ASSIGNOR TO AMERICAN SHOE MACHIN- ERY & TOOL COIEFANY, OF ST. LOUIS, MISSOURI.

SEWING MACHINE.

Application filed July 3, 1922.

To all whom it may concern:

Be it known that I, HARRY W. KRAG, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Sewing Machines, of which the following is a specification.

This invention relates to sewing machines and particularly to the means for cutting a channel in the work for the reception of the stitches. The objects of the invention are to provide for readily attaching and detaching the channel-cutter; to provide for ready adjustment of the channel-cutter,

' whereby the depth of the channel may be regulated; and to obtain certain other ad vantages which will hereinafter more fully appear.

The invention consists principally in a detachable channel-cutter for sewing machines and in means for adjusting said cutter to regulate the depth of the channel; and the invention also consists in the parts and in the arrangements and combinations of parts hereinafter described and claimed.

In the accompanying drawing, wherein like reference numerals refer to like parts wherever they occur,

Fig. l is a front elevation of a portion of a sewing machine provided with a channelcutter embodying my invention, the work support being shown in section; and

Fig. 2 is a side elevation of the parts shown in Fig. 1.

In the accompanying drawing my invention is shown in connection with a sewing machine, of which only the shuttle-head 3, the shuttle l, the needle 5 and the work support or needle-plate 6 are shown.

My channel-cutter comprises a cutting tool in the form of an inclined plate or blade 7 whose lower end portion is adapted to be secured fiatwise to the front face of the shuttle-head 3 by means of a cap-screw 8. The upper end portion of said channelcutter rests in a recess or groove 9 provided therefor in the adjacent marginal portion of the work support or needle-plate 6. The needle 5 works through a vertical opening in the work support and the recess 9 is located immediately forward of said needle and in alinement therewith. The upper edge of the inner end portion of the cutter extends horizontally and is tapered or beveled to a thin edge to form a comparatively short Serial No. 572,607.

knife-edge 7 for cutting achannel in the under surface of the work (not shown) during the travel of the work across the work supporting plate. The inner end portion of the channel-cutter has a sliding lit in the recess 9 in the work supporting plate; and the bottom of said recess is inclined downwardly, as at 10, from the inner end thereof towards the outer end thereof. The inner end portion of the channel cutter rests on the inclined portion of the recess 9; and the cap-screw 8 is preferablyloeated at an elevation that will bring'the lower edge of its inner portion parallel with the inclined bottom of said recess. The cap-screw 8, which serves to clamp the channel-cutter against the front face of the shuttle box, projects through an elongated slot 11 in the outer portion of said channel-cutter and is threaded into said shuttle box. This slot extends in a plane parallel with the edge of the channel-cutter that rests on the inclined bottom of the recess or groove 9 which edge extends parallel with the plane of the inclined bottom surface of said recess.

By the arrangement described, the channel-cutter is firmly secured to the machine by the securing member 8 and its cutting edgeis held against lateral movement by the walls of the recess provided there-for in the work supporting plate. When it is desired to cut a channel, the screw 8 is loosened and the channel-cutter pushed inwardly towards the work supporting table, which action, by reason of the inclined bottom of the recess, causes the channel-cutter to move upwardly and inwardly along said inclined surface thereby carrying the cutting edge of said channel-cutter above the top of the work supporting plate in position to engage the work and cut a channel therein. The depth of the channel depends on the distance the cutting edge of the channel-cutter is raised above the top surface of the work supporting plate.

The cutting tool may be readily adjusted to bring the cutting edge thereof below the surface of the work supporting table, thereby permitting the work to travel across the supporting plate without touching the cut ting edge of the channel plate. If desired, the cutting tool may be swung clear of the work by lifting its free end out of the recess and swinging said end outwardly and downwardly below the upper surface of the worktable. It is noted that the channel-cutter may be quickly and easily secured to and detached from the machine, thus making it easy tosharpen the cutting edge of the channel-cutter;

The invention is adapted for use with sewing machines of diflerent types; and it is not restricted to the particular shapes and arrangements of parts shown in the draw What I claim is-:

L. A- sewing machine comprising a worksupport having a groove in its upper surface whose bottom is inclined, and a channel *1 cutter disposed in said: groove and resting on:

'- face whose bottom is inclined, a channelcutter having its inner end portion located in said groove and resting on the inclined bottom thereof, the inner portion of said channel c'utter being provided with an upstanding cutting edge, and means for slidsupport having a groove in its' upper sur face whose bottom is inclii'ied, a channelcutter secured in said groove with its cuttin'gi edge uppermost,- said channel-cutter being slidably supported on the inclined bottom of said groove, whereby the elevation of the cutting edge of said channel-cutter may be varied, said channel-cutter being provided with an elongated slot, and a clamp screw extending through said slot and threaded into said machine, whereby said channelcutter is adapted to be locked in t 1e desired adjusted position.

Signed at St. Louis; l li'ssouri, this SOth day of June, 1922.

HARRY W. KRAG. 

